implement Drop for Job - prevent jobs from hanging in progress forever

src/util/jobs.rs

@@ -17,17 +17,23 @@ impl Job {
         S: AsRef<str>,
         IS: Into<Option<S>>,
     {
-        return Job {
+        Job {
             job_type: job_type.into().map(|jt| String::from(jt.as_ref())),
             title: String::from(title.as_ref()),
             ..Default::default()
-        };
+        }
+    }
+}
+
+impl Drop for Job {
+    fn drop(&mut self) {
+        self.state = State::Failed;
     }
 }
 
 pub type JobType = String;
 
-#[derive(Serialize, Clone, PartialEq)]
+#[derive(Serialize, Clone, Copy, PartialEq)]
 pub enum State {
     InProgress,
     Done,